2125531 has 2 divisors, whose sum is σ = 2125532. Its totient is φ = 2125530.

The previous prime is 2125523. The next prime is 2125537. The reversal of 2125531 is 1355212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2125531 - 2³ = 2125523 is a prime.

It is a super-2 number, since 2×2125531² = 9035764063922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2125499 and 2125508.

It is not a weakly prime, because it can be changed into another prime (2125537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062765 + 1062766.

It is an arithmetic number, because the mean of its divisors is an integer number (1062766).

2^2125531 is an apocalyptic number.

2125531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125531 is an equidigital number, since it uses as much as digits as its factorization.

2125531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 19.

The square root of 2125531 is about 1457.9200938323. The cubic root of 2125531 is about 128.5747872726.

It can be divided in two parts, 21 and 25531, that added together give a palindrome (25552).

The spelling of 2125531 in words is "two million, one hundred twenty-five thousand, five hundred thirty-one".